1. extremely; very
Usage: informal
2. in a mischievous or playfully wicked manner

Examples

• The puzzle was devilishly difficult to solve.
• She smiled devilishly before revealing her surprise.
• The weather turned devilishly cold overnight.
• He grinned devilishly as he planned his prank.
• The test questions were devilishly tricky.
• The child looked devilishly pleased with himself after hiding the cookies.